To change an IPv4 network to an IPv4 and IPv6 network, you must add an IPv6 network to an existing IPv4 network, as you do in steps 1 through 5 of the procedure documented in "Changing Static IPv4 Addresses To Static IPv6 Addresses Using SRVCTL".
After you complete those three steps, log in as the Grid user, and run the following command:
$ srvctl status scan
Review the output to confirm the changes to the SCAN VIPs.